Driving mechanism for turrets and like apparatus



Nov. 12, 1935.

' G. swAHNBr-:RG

DRIVING MECHANISM FOR TURRETS ND LIKE APP 2 Sheets-Sheet l Filed June'7, 1934 Patented Nov. l2, 1935 DRIVING MECHANISM FOR TRRETS AND. LIKEAPPARATUS Gunnar Swahnberg, Keene, N. H., assigner to Kingsbury MachineTool Corporation, Keene,

., a corpcration of New Hampshire Application June 7, 1934, SerialV No.729,507 3 Claims. (Cl. 25J-.50)

'Ihe flange 23 is illustratively provided with Y lugs 2:1 which extendinto peripheral notches 10 advanced of a turning plate 'H which issecured to the lie-nge 23 by screws 12. against' further rality ofshafts 73 An arrangement of this nature is illustrated but not claimedin the copending application of Edward J. Kingsbury, Serial No. 683,541,led August 3, 1933 A feature of. the present Vinvention is the einangeTF at ployment trative form of practicing the invention is shownrotating and holding deVl'CeS 0n the rotatale 2'5 on the accompanyingdrawings m which member and on the rotatable structure are con- Figure 1is a plan View of a machine 15001 turret cealed and protected and yetare available for unit embodying the present invention. .easy assemblyand disassembly by raising the Figure 2 is a side elevation of .thesame, with met tl-ble from DGSOH and replacing it parts broken away toshow the relationship oi therein 30 internal structures.

Figure 3 is a detail view on a larger scale, corresponding to a portionof Figure 1, and having parts broken away to indicate a sectionsubstanlb tially on line 3-3 of Figure 4.

Figure 4 is an upright sectional view substanaccomplish the indexingmovement of the turret tially on line 4-4 of Figure 3. table TT. e gapsbetween the substantially In these dr wings, a driving motor M operatesrectilinear surfaces Hz of adjacent elements Il a, o move a rotatableshaft l1 and the nange or approxlmate the external diameter of I isgiven a fractional revolution illustratively then retraces its course tthrough 180 degrees, upon each actuation of the ing period. The outerends ofthe elements have 45 solenoid 65. The gear train and like partsby arcuate curved surfaces I la: which are concentric which thismovement is effected may be of any with the circular shape of the plate'H when the desired character and form no part of the prescorrespondingelement is located in its nal posient invention A mechanism excellentlyadapttion (Figure l) above the plate 'H It will be ed for the purpose isillustrated in the aforesaid noted that each of the elements istherefore 50 Kingsbury application, to which reference is madesubstantially symmetrical about a line extendfora driving trainemliloyable for the purpose ing radially from the axis of rotation ofthe will be understood that at the start and turiet table TT and that asurface Ha: is end of each cycle, the parts are in a relativepositangential to a corresponding surface l Iy. tion such as illustratedin Figure 1, While the turret is at a standstill, the parts are, 65

` 2 Y Y v2,021,030 Y I single element IIa and thus holding the turret sfor example, in the position of Figure l, with Vthe two rollers 14a, 14hvillustratively engaging a table against movement as a result oftangential stresses in either direction applied to the turret table TT.The rollers 14d, 'Mbengage the element I'Ia at the aforesaidarcuateportions IIy thereof.

When a newindexing is to be accomplished,V the cycle is started byenergizing solenoid 65 inthe illustrative form so that the motor Mcauses the shaft I1 and therewith Vthe plate 1I to turn through 180degrees in` a clockwise directionin The upper roller V1lIa is thuscaused to advance relatively toward the axis of `rotation ofthe turrettable TT, engaging in the groove between the adjacent elementsfIIa, IIeuntil the axis of this inwardly movingrroller is in the line joining thecenters of the shaft III Vand theV axis of rotation of the turret tableTT Y (position Vof'Figures 3 and 4) The initial enl gagement of thisroller 'I4-a Yhas caused an ac- Y so that the element I Ia may move in aVcountery a new station.

clockwise direction past the roller. As the roller 14u passes from theintermediate position of Figure 3 toward the end position of Figure l',the

roller 14h moves relatively inward and engages an arcuate surface IIy ofthe succeeding elementV IIe. At the moment that the inwardly movingrollerV 14h encounters this surface II'y (corresponding topositionr'Illba in Figure l) the outwardly moving roller 14a is justpassing from the aforesaid groove onto its correspording arcuate surfaceIIy of the same element IIe (corresponding to position 'Maa in Figure l)rollers 14a, 14h in Figure 1, therefore, there is essentially norotative movement of the turret table TT and any peripheral strainsexerted upon theitur-ret table are absorbed by the rollers, so that theturret table is held xedly at station.

Each of the elements IIa, IIb,` etc., is of 1simi- -lar shape,resembling the shoe of a sad iron, andV is successively engaged and heldby the driving rollers 14a and 14h, so that each movement ofY 130degrees of the shaft I1 produces an advance- Y mentrof Vthe turret tableTT by an equal angular increment and presents the table in position atEach of these elements has the arcuate surfaces thereof extendingforsubstantially equal angles at either side ofthe line` A-A of Figure1which passes throughthe axis of shaft I1 and the'axis of the tworollers'while the latter are in the holding position. the outwardlj7Vmoving roller escapes from and clearsv the element which has just beenheld at substantially the Vsamev time that the other roller passes ontothe substantially rectilinear surface thereof Vfor accomplishing afurther advancement of the turret table;V and also the roller which hasbeen free enters upon an arcuate surface at substantially the same timethat the rollerY Ywhichhas been driving vpasses from the: groove ontothe corresponding arcuate surface 0i, the element to be held.

Between theV positions 'Mba and 14ml, and ,the positions of Theillustrated mechanism therefore permits the utilization of arotativemovement of 180 defA grecs from standstill to standstill ofshaft I'I for Y accomplishing Va lesser angular movement of the Y turrettable, along with a locating and blocking of the turret table at thedesired station when the shaft I1 is at Va standstill, without theemployment of any moving latches or l'ke auxiliary arts.

Obviously, the invention may be employed in 10 many. other wayswithinrthe scope of the appended claims. vHaving thus described theinvention, what I claim as new and desire` to secure by Letters Patent,is: Y Y

l. In a driving mechanism for Vturrets and like apparatus, a memberintermittently rotated through'lSO degrees, a turret structure lto beadvanced intermittently bjr/*equal angular increments ofV less thandegrees, two drivingde- V20 vices mounted eccentrically at diametricallyopposite points on said member, Aand a plurality of Vdriven elements onsaidstructure equal in number Vto the number'of said angular incrementsnecessary to move the structure through a single i5 i revolution, eachsaid element being constructed and arranged on said structure for`driving by one saidV device while the other devicefis presented Vbysaid member out of positionV for engagement by said element, each saidelement including sur- BPO'S facesfor engagement by b othvsaid devicessimul- I taneously for holding the structure against movement while themember is at a standstill, said the axis of said rriemberand thepoint'sof contact ofthe devices with the said surfaces of themomentarily engaged element, 'so that relative stresses upon saidstructure do not produce rotative movementfof said .member whereby thetui"` 40 ret structure is held immovable independent ofV anylatchingdevice. Y Y l Y 2.In a driving mechanism for turrets andi likeapparatus, a member rotatedintermittently ,L t through an angleof 180degrees, a turret struc 45"' ture to be advanced intermittently byangular said member,v a plurality or circumferentially spaced elementsfixed on said structure, each Yelement beingsubstantiallysymmetricalabout a 5i):V

radial line from the axis of said structure and having ,at ov e endVarcuate surfaces and also hav- .Y ing substantially rectilinearsurfaces Vtangential to said arcuate surfaces, the rectilinear surfacesof adjacent elements providingV grooves which extend in substantiallyradial directions Vwith respect tothe axis of said structure,` andeccentrically mounted rollers pivotally vmounted on said Y member vdiametrically opposite one another ,l and engageable in said grooves andwith said t Y Y surfaces, said member operating to presentone saidroller ina groove to drive sadstructure while holding anothersaidlroller clear" of the elements, the two arcuate surfaces of oneelefA ment beingV engaged simultaneously by'sa'd two 65 rollers when themember is at a standstill of Yits intermittent movement 1 whereby tohold the structure against movement by tangential stresses in eitherdirection thereon, said arcuate lement so engaged'being pre- 70 surfacesof the sented during such standstill inrconcentric posi?V tion withrespect to the axis of said member so that the accuracy of positioningand maintaining of the turret structure is not affectedY by minorVinaccuracies of positioning of the'said rollers. 7i t ein. en g held thesame immovable independently of any latching device.

GUNNAR SWAHNBERG.

